You cannot convert linear feet into square feet using length alone. Linear feet measure one-dimensional length, while square feet measure two-dimensional area.

How to Use the Linear Feet to Square Feet Calculator

Enter the values requested by the calculator.

1. Enter the Linear Feet

Linear footage is the total end-to-end length of the material.

For example:

Ten boards that are each 8 feet long equal 80 linear feet.
Five trim pieces that are each 12 feet long equal 60 linear feet.
Twenty planks that are each 6 feet long equal 120 linear feet.

Use:

Total linear feet = Number of pieces × Length of each piece

When pieces have different lengths, add them individually.

2. Enter the Material Width

Width is required to convert length into area.

Common examples include:

Flooring plank width
Siding exposure width
Wall-panel width
Deck-board width
Fabric or carpet-roll width
Roofing-strip width
Tile-border width

The calculator may accept width in:

Inches
Feet
Centimetres
Millimetres

Use the actual coverage width rather than the product’s advertised or nominal width whenever they differ.

3. Select the Conversion Direction

The calculator can usually perform both calculations:

Linear feet to square feet
Square feet to linear feet

Check that the correct mode is selected before entering the measurements.

4. Add Waste Separately

The mathematical conversion shows exact coverage before:

Cutting waste
Damaged pieces
Pattern matching
End trimming
Defects
Installation mistakes
Unusable offcuts

Use the waste allowance recommended by the product manufacturer or installer.

Linear Feet to Square Feet Formula

The standard area formula is:

Area = Length × Width

For linear footage:

Square feet = Linear feet × Material width in feet

When Width Is in Inches

Convert inches into feet by dividing by 12:

Width in feet = Width in inches ÷ 12

The complete shortcut is:

Square feet = Linear feet × Width in inches ÷ 12

A foot is a unit of length, while a square foot is an area containing 144 square inches. NIST defines the international foot as exactly 0.3048 metre and lists 144 square inches as one square foot.

Conversion Example

Suppose you have:

200 linear feet of boards
Board width of 8 inches

Convert the width:

8 ÷ 12 = 0.6667 feet

Calculate the area:

200 × 0.6667 = 133.33 square feet

Using the shortcut:

200 × 8 ÷ 12 = 133.33 square feet

Therefore, 200 linear feet of 8-inch-wide material covers approximately 133.33 square feet before waste.

Square Feet to Linear Feet Formula

To calculate the linear footage required for a known area, reverse the formula:

Linear feet = Square feet ÷ Width in feet

When width is measured in inches:

Linear feet = Square feet × 12 ÷ Width in inches

Example

You need to cover:

300 square feet
With boards 6 inches wide

Calculation:

300 × 12 ÷ 6 = 600 linear feet

You need 600 linear feet before adding waste.

Linear Feet Versus Square Feet

Measurement	Measures	Example
Linear foot	Length	A board measuring 12 feet long
Square foot	Area	A surface measuring 1 foot × 1 foot
Cubic foot	Volume	A space measuring 1 foot × 1 foot × 1 foot
Board foot	Lumber volume	144 cubic inches of lumber

Linear Feet

Linear feet, abbreviated as LF, lin ft or ln ft, measure distance along one dimension.

Examples include:

Baseboard length
Fence length
Pipe length
Gutter length
Trim length
Lumber length

One linear foot is exactly the same length as one regular foot:

1 linear foot = 1 foot = 12 inches

Square Feet

Square feet, abbreviated as sq ft, ft² or SF, measure area.

Examples include:

Floor area
Wall coverage
Roof area
Siding coverage
Patio area
Sheet material coverage

A square foot is:

1 foot × 1 foot = 1 square foot

Is “Lineal Foot” Different?

No meaningful difference exists in ordinary construction and material estimating.

“Lineal foot” and “linear foot” are commonly used to describe the same one-dimensional length measurement. “Linear foot” is the more standard wording.

How Many Square Feet Does One Linear Foot Cover?

The answer depends on width.

Material Width	Area Covered by 1 Linear Foot
1 inch	0.0833 sq ft
2 inches	0.1667 sq ft
3 inches	0.25 sq ft
4 inches	0.3333 sq ft
5 inches	0.4167 sq ft
6 inches	0.50 sq ft
8 inches	0.6667 sq ft
10 inches	0.8333 sq ft
12 inches	1.00 sq ft
18 inches	1.50 sq ft
24 inches	2.00 sq ft

This means:

One linear foot of 3-inch material covers 0.25 square foot.
One linear foot of 6-inch material covers 0.5 square foot.
One linear foot of 12-inch material covers 1 square foot.
One linear foot of 24-inch material covers 2 square feet.

Common Linear Feet to Square Feet Conversions

The following table shows how dramatically width changes the result.

Linear Feet	At 6 Inches Wide	At 8 Inches Wide	At 12 Inches Wide
10 LF	5 sq ft	6.67 sq ft	10 sq ft
12 LF	6 sq ft	8 sq ft	12 sq ft
20 LF	10 sq ft	13.33 sq ft	20 sq ft
25 LF	12.5 sq ft	16.67 sq ft	25 sq ft
30 LF	15 sq ft	20 sq ft	30 sq ft
40 LF	20 sq ft	26.67 sq ft	40 sq ft
50 LF	25 sq ft	33.33 sq ft	50 sq ft
60 LF	30 sq ft	40 sq ft	60 sq ft
70 LF	35 sq ft	46.67 sq ft	70 sq ft
100 LF	50 sq ft	66.67 sq ft	100 sq ft
120 LF	60 sq ft	80 sq ft	120 sq ft
200 LF	100 sq ft	133.33 sq ft	200 sq ft
300 LF	150 sq ft	200 sq ft	300 sq ft
400 LF	200 sq ft	266.67 sq ft	400 sq ft
1,000 LF	500 sq ft	666.67 sq ft	1,000 sq ft

100 Linear Feet to Square Feet

There is no single answer without width.

Width	Area Covered by 100 Linear Feet
2 inches	16.67 sq ft
3 inches	25 sq ft
4 inches	33.33 sq ft
5 inches	41.67 sq ft
6 inches	50 sq ft
8 inches	66.67 sq ft
10 inches	83.33 sq ft
12 inches	100 sq ft
24 inches	200 sq ft

Example for 6-inch boards:

100 × 6 ÷ 12 = 50 square feet

Square Feet to Linear Feet Conversion Table

Square Feet	3-Inch Width	4-Inch Width	6-Inch Width	8-Inch Width	12-Inch Width
50 sq ft	200 LF	150 LF	100 LF	75 LF	50 LF
100 sq ft	400 LF	300 LF	200 LF	150 LF	100 LF
200 sq ft	800 LF	600 LF	400 LF	300 LF	200 LF
500 sq ft	2,000 LF	1,500 LF	1,000 LF	750 LF	500 LF
1,000 sq ft	4,000 LF	3,000 LF	2,000 LF	1,500 LF	1,000 LF
1,300 sq ft	5,200 LF	3,900 LF	2,600 LF	1,950 LF	1,300 LF

These figures exclude waste.

How Many Linear Feet Are in 1,300 Square Feet?

The result depends on material width.

Use:

Linear feet = 1,300 × 12 ÷ Width in inches

Examples:

3-inch boards: 5,200 linear feet
4-inch boards: 3,900 linear feet
5-inch boards: 3,120 linear feet
6-inch boards: 2,600 linear feet
8-inch boards: 1,950 linear feet
12-inch material: 1,300 linear feet

If the question concerns the perimeter of a 1,300-square-foot room or building, the area alone is insufficient. The shape and dimensions are also required.

Why Width Is Required

Linear feet describe only length.

Consider two products that are both 100 linear feet long:

Product A is 3 inches wide.
Product B is 12 inches wide.

Product A covers:

100 × 3 ÷ 12 = 25 square feet

Product B covers:

100 × 12 ÷ 12 = 100 square feet

The lengths are identical, but the second product covers four times as much area.

This is why there is no fixed answer to questions such as:

How many square feet are in 50 linear feet?
How many linear feet are in 200 square feet?
How many square feet are in one linear foot?

Width must be known first.

Actual Width Versus Nominal Width

Use the width that will actually cover the finished surface.

A board may be sold as 6 inches wide but provide less than 6 inches of exposed coverage because of:

Tongue-and-groove edges
Shiplap overlap
Siding laps
Interlocking profiles
Trimmed edges
Manufacturer tolerances

Example

Suppose a board is nominally 6 inches wide but covers only 5.5 inches after installation.

For 500 linear feet:

Using nominal width:

500 × 6 ÷ 12 = 250 sq ft

Using actual coverage:

500 × 5.5 ÷ 12 = 229.17 sq ft

Difference:

20.83 square feet

Using nominal width would overstate coverage by more than 20 square feet.

Check the product specification for terms such as:

Actual width
Face width
Coverage width
Exposed width
Installed width

Calculating Mixed-Width Boards

When boards have different widths, calculate each width group separately.

Use:

Total square feet = Sum of each group’s linear feet × width ÷ 12

Example

You have:

100 LF of 4-inch boards
100 LF of 6-inch boards
100 LF of 8-inch boards

Calculations:

4-inch boards: 100 × 4 ÷ 12 = 33.33 sq ft

6-inch boards: 100 × 6 ÷ 12 = 50 sq ft

8-inch boards: 100 × 8 ÷ 12 = 66.67 sq ft

Total:

33.33 + 50 + 66.67 = 150 square feet

Do not add all the widths together and apply them to the combined footage unless each width has exactly the same linear footage.

Calculating Linear Feet for Flooring

Most complete flooring areas are measured in square feet. Individual boards may be tracked in linear feet.

To calculate flooring board footage:

Linear feet = Room square footage × 12 ÷ Actual board width in inches

Example: 200-Square-Foot Room

Using 5-inch-wide flooring:

200 × 12 ÷ 5 = 480 linear feet

Add the project-specific waste allowance afterward.

Multiple Rooms

Calculate the square footage of each room:

Room area = Length × Width

Add the rooms:

Total square footage = Room 1 + Room 2 + Room 3

Then convert the combined area into linear feet using the actual plank coverage width.

Calculating Linear Feet for Wall Paneling or Siding

Measure the net wall area first.

Wall area = Wall length × Wall height

Subtract openings when appropriate:

Net area = Gross wall area − Doors − Windows

Convert net square footage to linear footage:

Linear feet = Net square feet × 12 ÷ Coverage width in inches

Example

Wall area:

20 ft × 8 ft = 160 sq ft

Door opening:

3 ft × 7 ft = 21 sq ft

Net wall area:

160 − 21 = 139 sq ft

Using paneling with 6-inch coverage:

139 × 12 ÷ 6 = 278 linear feet

Purchase quantity should include the required cutting and installation allowance.

Calculating Linear Feet for Baseboards

Baseboards are normally calculated from room perimeter, not floor area.

For a rectangular room:

Perimeter = 2 × Length + 2 × Width

Subtract door openings when baseboard will not continue through them.

Example: 10 × 10 Room

2 × 10 + 2 × 10 = 40 linear feet

A 10 × 10 room has:

Floor area: 100 square feet
Wall perimeter: 40 linear feet

These are different measurements.

Example: 12 × 12 Room

2 × 12 + 2 × 12 = 48 linear feet

A 12 × 12 room has:

Floor area: 144 square feet
Wall perimeter: 48 linear feet

Do not convert the room’s square footage directly into baseboard footage without knowing its dimensions. A long, narrow room and a square room can have the same area but different perimeters.

How Many Linear Feet Is a 10 × 10 Room?

The answer depends on what is being measured.

Room Perimeter

A 10 × 10-foot room has:

10 + 10 + 10 + 10 = 40 linear feet

Floor Area

The floor covers:

10 × 10 = 100 square feet

Flooring Boards

For 6-inch-wide boards:

100 × 12 ÷ 6 = 200 linear feet

For 4-inch-wide boards:

100 × 12 ÷ 4 = 300 linear feet

Therefore, the answer can be 40, 200 or 300 linear feet depending on whether you mean perimeter or material coverage.

How Many Linear Feet Is a 12 × 12 Room?

Perimeter

12 + 12 + 12 + 12 = 48 linear feet

Floor Area

12 × 12 = 144 square feet

Flooring Material

At 6 inches wide:

144 × 12 ÷ 6 = 288 linear feet

At 8 inches wide:

144 × 12 ÷ 8 = 216 linear feet

At 12 inches wide:

144 × 12 ÷ 12 = 144 linear feet

Calculating Material Cost

The calculator can also help estimate material cost.

Material Sold by Linear Foot

Cost = Required linear feet × Price per linear foot

Example:

Required material: 250 LF
Price: $4.50 per LF

250 × $4.50 = $1,125

Material Sold by Square Foot

Cost = Required square feet × Price per square foot

Example:

Required coverage: 150 sq ft
Price: $7 per sq ft

150 × $7 = $1,050

Including Waste

Order quantity = Calculated quantity × (1 + Waste percentage)

For 250 linear feet with 10% extra:

250 × 1.10 = 275 linear feet

Cost at $4.50 per LF:

275 × $4.50 = $1,237.50

Linear Feet to Square Metres

For metric projects, use:

Square metres = Linear metres × Width in metres

When the length is in linear feet and width is in inches, calculate square feet first and then convert if required.

NIST defines one international foot as exactly 0.3048 metre.

Useful conversions include:

1 foot = 0.3048 metre
1 square foot = approximately 0.092903 square metre
1 square metre = approximately 10.7639 square feet

Common Conversion Mistakes

Converting Without Width

Length alone cannot produce area.

Incorrect:

100 linear feet = 100 square feet

Correct only when the material is exactly 12 inches wide:

100 × 12 ÷ 12 = 100 square feet

Using Inches as Feet

Incorrect:

100 LF × 6 = 600 sq ft

Correct:

100 × 6 ÷ 12 = 50 sq ft

The 6-inch width must first be converted into 0.5 foot.

Using Nominal Width

Tongue-and-groove, shiplap and siding profiles may cover less than their listed overall width.

Use exposed or installed coverage.

Confusing Area With Perimeter

A 10 × 10 room has:

100 square feet of floor area
40 linear feet of perimeter

Neither number can replace the other.

Forgetting Multiple Pieces

Add the lengths of every board, roll or panel before converting.

Ignoring Waste

The formula calculates mathematical coverage, not the quantity that must be purchased after cuts and unusable material.

Confusing Board Feet With Linear Feet

Board feet measure lumber volume. Linear feet measure only length.

A board can have the same linear length but a different board-foot volume depending on its width and thickness.

Frequently Asked Questions

How do you calculate square feet from linear feet?

Multiply the linear footage by the material width in feet:

Square feet = Linear feet × Width in feet

When width is in inches:

Square feet = Linear feet × Width in inches ÷ 12

For example, 120 linear feet of 6-inch material covers:

120 × 6 ÷ 12 = 60 square feet

How many feet are in a linear foot?

One linear foot equals exactly:

1 foot
12 inches
0.3333 yard
0.3048 metre

The word “linear” simply clarifies that the measurement refers to length rather than area or volume. NIST defines the international foot as exactly 0.3048 metre.

How many linear feet is 200 square feet?

Width is required.

Examples:

At 3 inches wide: 800 LF
At 4 inches wide: 600 LF
At 6 inches wide: 400 LF
At 8 inches wide: 300 LF
At 12 inches wide: 200 LF

Formula:

Linear feet = 200 × 12 ÷ Width in inches

Is LF the same as square feet?

No.

LF measures length. Square feet measure area.

A 10-foot board is 10 linear feet regardless of its width. Its square-foot coverage changes with width.

For example:

10 LF at 3 inches wide = 2.5 sq ft
10 LF at 6 inches wide = 5 sq ft
10 LF at 12 inches wide = 10 sq ft

What does 120 linear feet mean?

It means a total measured length of 120 feet.

That could be:

One 120-foot piece
Ten 12-foot pieces
Fifteen 8-foot pieces
Multiple pieces totaling 120 feet

It does not describe area until a width is provided.

At 6 inches wide, 120 LF covers 60 square feet. At 12 inches wide, it covers 120 square feet.

How many linear feet is a 10 × 10 room?

The perimeter is 40 linear feet.

The room area is 100 square feet.

The amount of flooring in linear feet depends on plank width:

4-inch boards: 300 LF
6-inch boards: 200 LF
8-inch boards: 150 LF
12-inch boards: 100 LF

How many linear feet is a 12 × 12 room?

The perimeter is 48 linear feet.

The floor area is 144 square feet.

For flooring:

4-inch boards: 432 LF
6-inch boards: 288 LF
8-inch boards: 216 LF
12-inch boards: 144 LF

How big is 10 linear feet?

Ten linear feet is a straight length equal to:

10 feet
120 inches
3.333 yards
3.048 metres

Its area depends on width.

For example:

10 LF × 6 inches = 5 sq ft
10 LF × 12 inches = 10 sq ft
10 LF × 24 inches = 20 sq ft

How much area does one linear foot cover?

Use:

Area per linear foot = Width in inches ÷ 12

Examples:

3-inch width = 0.25 sq ft
4-inch width = 0.333 sq ft
6-inch width = 0.5 sq ft
8-inch width = 0.667 sq ft
12-inch width = 1 sq ft

How many linear feet are in one square foot?

The answer depends on material width.

Use:

Linear feet per square foot = 12 ÷ Width in inches

Examples:

3-inch material: 4 LF per sq ft
4-inch material: 3 LF per sq ft
6-inch material: 2 LF per sq ft
8-inch material: 1.5 LF per sq ft
12-inch material: 1 LF per sq ft

How much is 50 linear feet?

Fifty linear feet means 50 feet of total length, equal to 600 inches.

Its square footage depends on width:

At 4 inches wide: 16.67 sq ft
At 6 inches wide: 25 sq ft
At 8 inches wide: 33.33 sq ft
At 12 inches wide: 50 sq ft

Its cost depends on the price per linear foot.

Is a linear foot the same as a regular foot?

Yes. Both represent 12 inches of length.

The term linear foot is mainly used to distinguish length from square feet and cubic feet.

What is a linear square foot?

“Linear square foot” is not a standard measurement.

The correct term is normally either:

Linear foot for length
Square foot for area

When someone uses “linear square feet,” ask whether they need length or surface coverage.

Can square footage be converted into room perimeter?

Not without the room dimensions or shape.

A 100-square-foot square room measures 10 × 10 feet and has a 40-foot perimeter.

A 100-square-foot room measuring 5 × 20 feet has a 50-foot perimeter.

The areas are identical, but the linear footage around the walls is different.

Final Conversion Checklist

Before using the result, confirm:

Total linear footage
Actual material width
Width unit
Conversion direction
Nominal versus exposed width
Number of material pieces
Mixed-width sections
Openings being subtracted
Required waste allowance
Whether the project needs area or perimeter
Whether pricing is per linear foot or square foot

The calculator provides exact mathematical coverage from the measurements entered. The final purchase quantity should also account for the product profile, installation pattern, cuts and manufacturer recommendations.